Licensing issue for java librairies

Hi guys;
there are some java libraries that are free for non commercial use but require to purchase a license for commercial applications.
My question is : what if some one use this library in commercial app without purchasing licence ? how can the owner of the librairy control the use of his work. and if you use it for commercial purposes what will happen ?

there are some java libraries that are free for non
commercial use but require to purchase a license for
commercial applications.yes there is. This is true also of non java software.
There is also the GPL (GNU public license) which allows you to distribute the code, but only in an open source way.
My question is : what if some one use this library in
commercial app without purchasing licence ? how can
the owner of the librairy control the use of his
work. and if you use it for commercial purposes what
will happen ?Then you have a lawsuit. The damaged party may seek compensation and potentially damages from the license violator. The license owner may also seek an injunction

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